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calibrating iron test kits

Jim Spencer recently tested his LaMotte iron kit on a solution of
0.15ppm. Could you repeat this test using solutions of approximately 1
and 10 parts per million Jim? The reading of 0.1-0.2 ppm may be
misleading. The Red Sea test kit gives the same reading but is reported
to not detect the chelated Fe in high concentrations. It would also be
good to perform the test using DTPA, EDTA and a combination of both
chelating agents (the most stable).